Many phone as the Samsung have a pretty decent "remasterize image" option wich is basically an upscale and color correction setting. You can find even better software x pc.
Me making lower-color stylized images (and optimizing them) so I can use .PNGs that aren't too much data: <53.8 KiB image>
Though most of the time I use an image it's probably something I want to use more than once in comments, it would be good to use some other service for image hosting (I deleted my imgur account because of their changes even though they did not affect me directly).
Also, a similar treatment with OP's 142.8 KiB image (no text though) to get it to 600x500 puts it at 24.6KiB. Less aesthetic change here, more pixel-y but that might be influenced by starting from a noisy version though. Softer/better/different versions can be had for slightly more data.
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